diff --git a/lib/LocalizedStrings.js b/lib/LocalizedStrings.js
index bcc3b78..ac1bf12 100644
--- a/lib/LocalizedStrings.js
+++ b/lib/LocalizedStrings.js
@@ -46,7 +46,7 @@ if (!localization) {
  * Custom Interface Language method returned by native code
  */
 function getInterfaceLanguage() {
-  return localization.language.replace(/_/g, "-");
+  return localization ? localization.language.replace(/_/g, '-') : 'en';
 }
 
 /**